var uploadPreview = function (setting) {
  var _self = this;
  _self.IsNull = function (value) {
    if (typeof (value) == "function") {
      return false;
    }
    if (value == undefined || value == null || value == "" || value.length == 0) {
      return true;
    }
    return false;
  }
  _self.DefautlSetting = {
    UpBtn: "",
    DivShow: "",
    ImgShow: "",
    Width: 100,
    Height: 100,
    ImgType: ["gif", "jpeg", "jpg", "bmp", "png"],
    ErrMsg: "选择文件错误,图片类型必须是(gif,jpeg,jpg,bmp,png)中的一种",
    callback: function () { }
  };
  _self.Setting = {
    UpBtn: _self.IsNull(setting.UpBtn) ? _self.DefautlSetting.UpBtn : setting.UpBtn,
    DivShow: _self.IsNull(setting.DivShow) ? _self.DefautlSetting.DivShow : setting.DivShow,
    ImgShow: _self.IsNull(setting.ImgShow) ? _self.DefautlSetting.ImgShow : setting.ImgShow,
    Width: _self.IsNull(setting.Width) ? _self.DefautlSetting.Width : setting.Width,
    Height: _self.IsNull(setting.Height) ? _self.DefautlSetting.Height : setting.Height,
    ImgType: _self.IsNull(setting.ImgType) ? _self.DefautlSetting.ImgType : setting.ImgType,
    ErrMsg: _self.IsNull(setting.ErrMsg) ? _self.DefautlSetting.ErrMsg : setting.ErrMsg,
    callback: _self.IsNull(setting.callback) ? _self.DefautlSetting.callback : setting.callback
  };
  _self.getObjectURL = function (file) {
    var url = null;
    if (window.createObjectURL != undefined) {
      url = window.createObjectURL(file);
    } else if (window.URL != undefined) {
      url = window.URL.createObjectURL(file);
    } else if (window.webkitURL != undefined) {
      url = window.webkitURL.createObjectURL(file);
    }
    return url;
  }
  _self.Bind = function () {
    document.getElementById(_self.Setting.UpBtn).onchange = function () {
      if (this.value) {
        if (!RegExp("\.(" + _self.Setting.ImgType.join("|") + ")$", "i").test(this.value.toLowerCase())) {
          alert(_self.Setting.ErrMsg);
          this.value = "";
          return false;
        }
        if (navigator.userAgent.indexOf("MSIE") > -1) {
          try {
            document.getElementById(_self.Setting.ImgShow).src = _self.getObjectURL(this.files[0]);
          } catch (e) {
            var div = document.getElementById(_self.Setting.DivShow);
            this.select();
            top.parent.document.body.focus();
            var src = document.selection.createRange().text;
            document.selection.empty();
            document.getElementById(_self.Setting.ImgShow).style.display = "none";
            div.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
            div.style.width = _self.Setting.Width + "px";
            div.style.height = _self.Setting.Height + "px";
            div.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = src;
          }
        } else {
          document.getElementById(_self.Setting.ImgShow).src = _self.getObjectURL(this.files[0]);
        }
        _self.Setting.callback();
      }
    }
  }
  _self.Bind();
};